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Posterizing Colors

Posterizing, in effect, means reducing the number of colors available in the image. You’ll find the Posterize command on the Image, Adjustments menu. Instead of pixel-by-pixel full color, you see large flat areas in a photo, making it look rather like a silk screen print. When you posterize an image, the dialog box shown in Figure 21.1 lets you specify the number of tonal levels (or brightness values) for the three channels (red, green, and blue) in the image and then maps pixels to the closest matching level. For example, choosing two tonal levels in an RGB image gives a total of six colors: two shades of red, two of green, and two of blue.

Figure 21.1. Start with a small number of levels.



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